I have a SharePoint list which has a managed metadata column. This is bound to my term store which look like as following:

Cars

Mercedes

S600

CL65

G

BMW

5

6

7

X5

Maybach

...

Bentley

I want to query via CAML this list. I have a custom application page where the user is able to select the terms from the term store by drop downs. Given is a ListItem where the user has selected the term "S600" from the parent term "Mercedes". Lets think that the user now only selects "Mercedes".

How can I query the list with CAML so that I also get all items which where tagged with the children of the term "Mercedes"?

In short: How can I build a CAML query which can get all items with the selected parent terms child terms?